do i love mopar too much

Think back to before you ever had cars, what caused the friction between you brothers? Because the resentment probably goes back to some other issues but it has manifested itself in the car rivalry. Maybe you can start spending more time with your brothers and when the arguments start don't play into them. If you have a good family you should try to stay close, there may be a time when you need each other, and cars won't mean a damn.